Grades · 20#
20# Seamless Steel Pipe
Low-carbon workhorse grade. Weldable, easy to machine and forgiving in fabrication, which is why it is the most stocked grade in our yard. Used where strength requirements are moderate but consistency and availability matter.
465
Sizes in stock
Φ95–630
OD range (mm)
15–120
Wall range (mm)
GB/T 8163
Standard
International equivalents
| Chinese standard | GB/T 8163 · GB/T 8162 |
|---|---|
| Closest equivalent | ASTM A106 Gr.B |
| Also comparable | AISI 1020 |
| Also comparable | JIS S20C |
| Also comparable | DIN St 35 |
Typical properties
| Tensile strength | ≥ 410 MPa (standard minimum) |
|---|---|
| Yield strength | ≥ 245 MPa (standard minimum) |
| Elongation | ≥ 21% |
| Weldability | Good — no preheat required for normal sections |
Typical applications
- Fluid and low-pressure transmission lines
- Structural and mechanical fabrication
- General machining stock and hollow sections
- Hydraulic cylinder tube (lighter duty)
Delivery conditions
The delivery condition changes the material more than most buyers expect. Tell us what the part has to do and we will recommend one.
Hot rolledNormalizedStress relieved
20# sizes on the ground
465 combinations, updated 2026-08-22. Quantities turn over daily — confirm availability when you inquire.
| OD × Wall (mm) | OD (in) |
|---|---|
| Φ95 × 20 | 3.74″ |
| Φ95 × 23 | 3.74″ |
| Φ108 × 18 | 4.25″ |
| Φ114 × 16 | 4.49″ |
| Φ114 × 22 | 4.49″ |
| Φ127 × 24 | 5.00″ |
| Φ127 × 26 | 5.00″ |
| Φ133 × 24 | 5.24″ |
| Φ133 × 35 | 5.24″ |
| Φ140 × 40 | 5.51″ |
| Φ146 × 32 | 5.75″ |
| Φ152 × 28 | 5.98″ |
| Φ159 × 24 | 6.26″ |
| Φ159 × 38 | 6.26″ |
| Φ159 × 40 | 6.26″ |
| Φ168 × 32 | 6.61″ |
| Φ168 × 38 | 6.61″ |
| Φ168 × 40 | 6.61″ |
| Φ168 × 42 | 6.61″ |
| Φ168 × 45 | 6.61″ |
| Φ168 × 46 | 6.61″ |
| Φ170 × 50 | 6.69″ |
| Φ178 × 19 | 7.01″ |
| Φ180 × 30 | 7.09″ |
| Φ180 × 32 | 7.09″ |
| Φ180 × 35 | 7.09″ |
| Φ180 × 38 | 7.09″ |
| Φ180 × 40 | 7.09″ |
| Φ180 × 42 | 7.09″ |
| Φ180 × 45 | 7.09″ |
| Φ180 × 50 | 7.09″ |
| Φ188 × 25 | 7.40″ |
| Φ194 × 21 | 7.64″ |
| Φ194 × 25 | 7.64″ |
| Φ194 × 25.4 | 7.64″ |
| Φ194 × 26 | 7.64″ |
| Φ194 × 30 | 7.64″ |
| Φ194 × 32 | 7.64″ |
| Φ194 × 35 | 7.64″ |
| Φ194 × 40 | 7.64″ |
| Φ194 × 45 | 7.64″ |
| Φ194 × 55 | 7.64″ |
| Φ194 × 60 | 7.64″ |
| Φ203 × 20 | 7.99″ |
| Φ203 × 22 | 7.99″ |
| Φ203 × 24 | 7.99″ |
| Φ203 × 25 | 7.99″ |
| Φ203 × 30 | 7.99″ |
| Φ203 × 32 | 7.99″ |
| Φ203 × 40 | 7.99″ |
| Φ203 × 45 | 7.99″ |
| Φ203 × 50 | 7.99″ |
| Φ203 × 55 | 7.99″ |
| Φ210 × 22 | 8.27″ |
| Φ210 × 64 | 8.27″ |
| Φ219 × 18 | 8.62″ |
| Φ219 × 20 | 8.62″ |
| Φ219 × 22 | 8.62″ |
| Φ219 × 23 | 8.62″ |
| Φ219 × 25 | 8.62″ |
| Φ219 × 27 | 8.62″ |
| Φ219 × 32 | 8.62″ |
| Φ219 × 35 | 8.62″ |
| Φ219 × 38 | 8.62″ |
| Φ219 × 40 | 8.62″ |
| Φ219 × 45 | 8.62″ |
| Φ219 × 60 | 8.62″ |
| Φ219 × 65 | 8.62″ |
| Φ224 × 22 | 8.82″ |
| Φ224 × 25 | 8.82″ |
| Φ224 × 35 | 8.82″ |
| Φ232 × 20 | 9.13″ |
| Φ232 × 22 | 9.13″ |
| Φ232 × 25 | 9.13″ |
| Φ232 × 35 | 9.13″ |
| Φ232 × 38 | 9.13″ |
| Φ232 × 40 | 9.13″ |
| Φ232 × 41 | 9.13″ |
| Φ232 × 42 | 9.13″ |
| Φ232 × 45 | 9.13″ |
| Φ232 × 50 | 9.13″ |
| Φ232 × 55 | 9.13″ |
| Φ232 × 60 | 9.13″ |
| Φ232 × 65 | 9.13″ |
| Φ232 × 70 | 9.13″ |
| Φ238 × 35 | 9.37″ |
| Φ238 × 40 | 9.37″ |
| Φ238 × 45 | 9.37″ |
| Φ238 × 60 | 9.37″ |
| Φ245 × 15 | 9.65″ |
| Φ245 × 19 | 9.65″ |
| Φ245 × 21 | 9.65″ |
| Φ245 × 22 | 9.65″ |
| Φ245 × 25 | 9.65″ |
| Φ245 × 27 | 9.65″ |
| Φ245 × 28 | 9.65″ |
| Φ245 × 30 | 9.65″ |
| Φ245 × 32 | 9.65″ |
| Φ245 × 33 | 9.65″ |
| Φ245 × 35 | 9.65″ |
| Φ245 × 36 | 9.65″ |
| Φ245 × 38 | 9.65″ |
| Φ245 × 40 | 9.65″ |
| Φ245 × 42 | 9.65″ |
| Φ245 × 45 | 9.65″ |
| Φ245 × 50 | 9.65″ |
| Φ245 × 55 | 9.65″ |
| Φ245 × 60 | 9.65″ |
| Φ245 × 65 | 9.65″ |
| Φ245 × 70 | 9.65″ |
| Φ245 × 75 | 9.65″ |
| Φ254 × 22 | 10.00″ |
| Φ254 × 30 | 10.00″ |
| Φ254 × 32 | 10.00″ |
| Φ254 × 35 | 10.00″ |
| Φ254 × 40 | 10.00″ |
| Φ254 × 42 | 10.00″ |
| Φ254 × 45 | 10.00″ |
| Φ254 × 50 | 10.00″ |
| Φ254 × 60 | 10.00″ |
| Φ254 × 65 | 10.00″ |
| Φ254 × 70 | 10.00″ |
| Φ254 × 75 | 10.00″ |
| Φ255 × 24.5 | 10.04″ |
| Φ258 × 45 | 10.16″ |
| Φ267 × 40 | 10.51″ |
| Φ269 × 39 | 10.59″ |
| Φ269 × 40 | 10.59″ |
| Φ273 × 16 | 10.75″ |
| Φ273 × 18 | 10.75″ |
| Φ273 × 20 | 10.75″ |
| Φ273 × 22 | 10.75″ |
| Φ273 × 25 | 10.75″ |
| Φ273 × 27 | 10.75″ |
| Φ273 × 28 | 10.75″ |
| Φ273 × 30 | 10.75″ |
| Φ273 × 32 | 10.75″ |
| Φ273 × 35 | 10.75″ |
| Φ273 × 38 | 10.75″ |
| Φ273 × 40 | 10.75″ |
| Φ273 × 42 | 10.75″ |
| Φ273 × 50 | 10.75″ |
| Φ273 × 55 | 10.75″ |
| Φ273 × 60 | 10.75″ |
| Φ273 × 65 | 10.75″ |
| Φ273 × 70 | 10.75″ |
| Φ273 × 75 | 10.75″ |
| Φ273 × 80 | 10.75″ |
| Φ273.1 × 27 | 10.75″ |
| Φ285 × 17 | 11.22″ |
| Φ285 × 18 | 11.22″ |
| Φ285 × 20 | 11.22″ |
| Φ285 × 30 | 11.22″ |
| Φ285 × 50 | 11.22″ |
| Φ285 × 55 | 11.22″ |
| Φ285 × 65 | 11.22″ |
| Φ285 × 68 | 11.22″ |
| Φ285 × 70 | 11.22″ |
| Φ285 × 75 | 11.22″ |
| Φ285 × 80 | 11.22″ |
| Φ290 × 40 | 11.42″ |
| Φ299 × 16 | 11.77″ |
| Φ299 × 18 | 11.77″ |
| Φ299 × 20 | 11.77″ |
| Φ299 × 21 | 11.77″ |
| Φ299 × 22 | 11.77″ |
| Φ299 × 35 | 11.77″ |
| Φ299 × 38 | 11.77″ |
| Φ299 × 40 | 11.77″ |
| Φ299 × 42 | 11.77″ |
| Φ299 × 45 | 11.77″ |
| Φ299 × 50 | 11.77″ |
| Φ299 × 55 | 11.77″ |
| Φ299 × 60 | 11.77″ |
| Φ299 × 70 | 11.77″ |
| Φ299 × 75 | 11.77″ |
| Φ299 × 80 | 11.77″ |
| Φ299 × 85 | 11.77″ |
| Φ305 × 60 | 12.01″ |
| Φ306 × 25 | 12.05″ |
| Φ306 × 43 | 12.05″ |
| Φ306 × 45 | 12.05″ |
| Φ306 × 50 | 12.05″ |
| Φ306 × 65 | 12.05″ |
| Φ310 × 45 | 12.20″ |
| Φ323.9 × 31 | 12.75″ |
| Φ325 × 18 | 12.80″ |
| Φ325 × 20 | 12.80″ |
| Φ325 × 21 | 12.80″ |
| Φ325 × 22 | 12.80″ |
| Φ325 × 23 | 12.80″ |
| Φ325 × 24 | 12.80″ |
| Φ325 × 25 | 12.80″ |
| Φ325 × 28 | 12.80″ |
| Φ325 × 30 | 12.80″ |
| Φ325 × 32 | 12.80″ |
| Φ325 × 33 | 12.80″ |
| Φ325 × 35 | 12.80″ |
| Φ325 × 37 | 12.80″ |
| Φ325 × 38 | 12.80″ |
| Φ325 × 40 | 12.80″ |
| Φ325 × 42 | 12.80″ |
| Φ325 × 50 | 12.80″ |
| Φ325 × 55 | 12.80″ |
| Φ325 × 60 | 12.80″ |
| Φ325 × 65 | 12.80″ |
| Φ325 × 70 | 12.80″ |
| Φ325 × 80 | 12.80″ |
| Φ325 × 90 | 12.80″ |
| Φ330 × 44 | 12.99″ |
| Φ335 × 50 | 13.19″ |
| Φ340 × 35 | 13.39″ |
| Φ340 × 40 | 13.39″ |
| Φ340 × 45 | 13.39″ |
| Φ340 × 50 | 13.39″ |
| Φ340 × 67.5 | 13.39″ |
| Φ351 × 18 | 13.82″ |
| Φ351 × 19 | 13.82″ |
| Φ351 × 20 | 13.82″ |
| Φ351 × 22 | 13.82″ |
| Φ351 × 23 | 13.82″ |
| Φ351 × 25 | 13.82″ |
| Φ351 × 26 | 13.82″ |
| Φ351 × 28 | 13.82″ |
| Φ351 × 30 | 13.82″ |
| Φ351 × 32 | 13.82″ |
| Φ351 × 38 | 13.82″ |
| Φ351 × 40 | 13.82″ |
| Φ351 × 45 | 13.82″ |
| Φ351 × 55 | 13.82″ |
| Φ351 × 60 | 13.82″ |
| Φ351 × 65 | 13.82″ |
| Φ351 × 70 | 13.82″ |
| Φ351 × 75 | 13.82″ |
| Φ355.6 × 26 | 14.00″ |
| Φ355.6 × 33.5 | 14.00″ |
| Φ356 × 19 | 14.02″ |
| Φ356 × 20 | 14.02″ |
| Φ356 × 22 | 14.02″ |
| Φ356 × 24 | 14.02″ |
| Φ356 × 25 | 14.02″ |
| Φ356 × 26 | 14.02″ |
| Φ356 × 28 | 14.02″ |
| Φ356 × 30 | 14.02″ |
| Φ356 × 35 | 14.02″ |
| Φ356 × 39 | 14.02″ |
| Φ356 × 50 | 14.02″ |
| Φ356 × 55 | 14.02″ |
| Φ356 × 65 | 14.02″ |
| Φ356 × 70 | 14.02″ |
| Φ356 × 85 | 14.02″ |
| Φ356 × 95 | 14.02″ |
| Φ359 × 20 | 14.13″ |
| Φ360 × 20 | 14.17″ |
| Φ368 × 42 | 14.49″ |
| Φ368 × 45 | 14.49″ |
| Φ368 × 50 | 14.49″ |
| Φ372 × 70 | 14.65″ |
| Φ377 × 27 | 14.84″ |
| Φ377 × 28 | 14.84″ |
| Φ377 × 30 | 14.84″ |
| Φ377 × 32 | 14.84″ |
| Φ377 × 35 | 14.84″ |
| Φ377 × 40 | 14.84″ |
| Φ377 × 45 | 14.84″ |
| Φ377 × 50 | 14.84″ |
| Φ377 × 55 | 14.84″ |
| Φ377 × 60 | 14.84″ |
| Φ377 × 70 | 14.84″ |
| Φ390 × 25 | 15.35″ |
| Φ390 × 30 | 15.35″ |
| Φ390 × 32 | 15.35″ |
| Φ390 × 35 | 15.35″ |
| Φ390 × 40 | 15.35″ |
| Φ390 × 65 | 15.35″ |
| Φ390 × 70 | 15.35″ |
| Φ390 × 75 | 15.35″ |
| Φ390 × 90 | 15.35″ |
| Φ390 × 95 | 15.35″ |
| Φ402 × 20 | 15.83″ |
| Φ402 × 30 | 15.83″ |
| Φ402 × 45 | 15.83″ |
| Φ402 × 50 | 15.83″ |
| Φ402 × 55 | 15.83″ |
| Φ402 × 60 | 15.83″ |
| Φ402 × 65 | 15.83″ |
| Φ402 × 75 | 15.83″ |
| Φ402 × 80 | 15.83″ |
| Φ402 × 95 | 15.83″ |
| Φ406 × 25 | 15.98″ |
| Φ406 × 28 | 15.98″ |
| Φ406 × 32 | 15.98″ |
| Φ406 × 35 | 15.98″ |
| Φ406 × 40 | 15.98″ |
| Φ406 × 50 | 15.98″ |
| Φ406 × 55 | 15.98″ |
| Φ406 × 60 | 15.98″ |
| Φ406 × 65 | 15.98″ |
| Φ406 × 75 | 15.98″ |
| Φ406 × 80 | 15.98″ |
| Φ406.4 × 38 | 16.00″ |
| Φ408 × 65 | 16.06″ |
| Φ419 × 45 | 16.50″ |
| Φ419 × 58.5 | 16.50″ |
| Φ420 × 26 | 16.54″ |
| Φ420 × 35 | 16.54″ |
| Φ426 × 20 | 16.77″ |
| Φ426 × 21 | 16.77″ |
| Φ426 × 23 | 16.77″ |
| Φ426 × 27 | 16.77″ |
| Φ426 × 28 | 16.77″ |
| Φ426 × 29 | 16.77″ |
| Φ426 × 30 | 16.77″ |
| Φ426 × 32 | 16.77″ |
| Φ426 × 35 | 16.77″ |
| Φ426 × 37 | 16.77″ |
| Φ426 × 38 | 16.77″ |
| Φ426 × 40 | 16.77″ |
| Φ426 × 42 | 16.77″ |
| Φ426 × 45 | 16.77″ |
| Φ426 × 48 | 16.77″ |
| Φ426 × 55 | 16.77″ |
| Φ426 × 60 | 16.77″ |
| Φ426 × 62 | 16.77″ |
| Φ426 × 65 | 16.77″ |
| Φ426 × 75 | 16.77″ |
| Φ426 × 80 | 16.77″ |
| Φ426 × 85 | 16.77″ |
| Φ426 × 90 | 16.77″ |
| Φ426 × 95 | 16.77″ |
| Φ426 × 100 | 16.77″ |
| Φ428 × 25 | 16.85″ |
| Φ430 × 35 | 16.93″ |
| Φ435 × 42 | 17.13″ |
| Φ435 × 65 | 17.13″ |
| Φ435 × 105 | 17.13″ |
| Φ440 × 30 | 17.32″ |
| Φ440 × 35 | 17.32″ |
| Φ440 × 50 | 17.32″ |
| Φ440 × 55 | 17.32″ |
| Φ440 × 60 | 17.32″ |
| Φ440 × 70 | 17.32″ |
| Φ440 × 75 | 17.32″ |
| Φ440 × 80 | 17.32″ |
| Φ440 × 85 | 17.32″ |
| Φ445 × 60 | 17.52″ |
| Φ450 × 29 | 17.72″ |
| Φ450 × 30 | 17.72″ |
| Φ450 × 40 | 17.72″ |
| Φ450 × 45 | 17.72″ |
| Φ450 × 60 | 17.72″ |
| Φ450 × 65 | 17.72″ |
| Φ450 × 75 | 17.72″ |
| Φ450 × 80 | 17.72″ |
| Φ450 × 115 | 17.72″ |
| Φ455 × 85 | 17.91″ |
| Φ457 × 20 | 17.99″ |
| Φ457 × 22 | 17.99″ |
| Φ457 × 25 | 17.99″ |
| Φ457 × 27 | 17.99″ |
| Φ457 × 28 | 17.99″ |
| Φ457 × 35 | 17.99″ |
| Φ457 × 37 | 17.99″ |
| Φ457 × 38 | 17.99″ |
| Φ457 × 40 | 17.99″ |
| Φ457 × 45 | 17.99″ |
| Φ457 × 50 | 17.99″ |
| Φ457 × 55 | 17.99″ |
| Φ457 × 60 | 17.99″ |
| Φ457 × 70 | 17.99″ |
| Φ457 × 80 | 17.99″ |
| Φ457.2 × 33 | 18.00″ |
| Φ457.2 × 37 | 18.00″ |
| Φ457.2 × 42.5 | 18.00″ |
| Φ463 × 40 | 18.23″ |
| Φ470 × 30 | 18.50″ |
| Φ470 × 35 | 18.50″ |
| Φ470 × 40 | 18.50″ |
| Φ470 × 45 | 18.50″ |
| Φ471 × 30 | 18.54″ |
| Φ471 × 35 | 18.54″ |
| Φ473 × 40 | 18.62″ |
| Φ473 × 42 | 18.62″ |
| Φ475 × 45 | 18.70″ |
| Φ480 × 28 | 18.90″ |
| Φ480 × 35 | 18.90″ |
| Φ480 × 43 | 18.90″ |
| Φ480 × 55 | 18.90″ |
| Φ480 × 60 | 18.90″ |
| Φ480 × 62 | 18.90″ |
| Φ480 × 70 | 18.90″ |
| Φ480 × 90 | 18.90″ |
| Φ483 × 65 | 19.02″ |
| Φ490 × 50 | 19.29″ |
| Φ490 × 55 | 19.29″ |
| Φ490 × 70 | 19.29″ |
| Φ493 × 40 | 19.41″ |
| Φ495 × 45 | 19.49″ |
| Φ500 × 50 | 19.69″ |
| Φ508 × 30 | 20.00″ |
| Φ508 × 31 | 20.00″ |
| Φ508 × 35 | 20.00″ |
| Φ508 × 42 | 20.00″ |
| Φ508 × 47 | 20.00″ |
| Φ508 × 50 | 20.00″ |
| Φ508 × 55 | 20.00″ |
| Φ530 × 30 | 20.87″ |
| Φ530 × 38 | 20.87″ |
| Φ530 × 85 | 20.87″ |
| Φ530 × 95 | 20.87″ |
| Φ530 × 100 | 20.87″ |
| Φ530 × 110 | 20.87″ |
| Φ530 × 120 | 20.87″ |
| Φ535 × 75 | 21.06″ |
| Φ550 × 60 | 21.65″ |
| Φ550 × 80 | 21.65″ |
| Φ550 × 85 | 21.65″ |
| Φ550 × 90 | 21.65″ |
| Φ560 × 60 | 22.05″ |
| Φ560 × 65 | 22.05″ |
| Φ560 × 70 | 22.05″ |
| Φ560 × 75 | 22.05″ |
| Φ560 × 85 | 22.05″ |
| Φ560 × 110 | 22.05″ |
| Φ570 × 75 | 22.44″ |
| Φ580 × 50 | 22.83″ |
| Φ580 × 55 | 22.83″ |
| Φ580 × 60 | 22.83″ |
| Φ580 × 65 | 22.83″ |
| Φ580 × 75 | 22.83″ |
| Φ580 × 90 | 22.83″ |
| Φ580 × 110 | 22.83″ |
| Φ585 × 60 | 23.03″ |
| Φ590 × 60 | 23.23″ |
| Φ595 × 55 | 23.43″ |
| Φ600 × 40 | 23.62″ |
| Φ600 × 50 | 23.62″ |
| Φ600 × 55 | 23.62″ |
| Φ600 × 60 | 23.62″ |
| Φ600 × 75 | 23.62″ |
| Φ600 × 80 | 23.62″ |
| Φ610 × 38 | 24.02″ |
| Φ610 × 40 | 24.02″ |
| Φ610 × 42 | 24.02″ |
| Φ610 × 45 | 24.02″ |
| Φ610 × 47 | 24.02″ |
| Φ610 × 50 | 24.02″ |
| Φ610 × 55 | 24.02″ |
| Φ610 × 60 | 24.02″ |
| Φ610 × 65 | 24.02″ |
| Φ610 × 75 | 24.02″ |
| Φ610 × 85 | 24.02″ |
| Φ615 × 70 | 24.21″ |
| Φ620 × 48 | 24.41″ |
| Φ620 × 50 | 24.41″ |
| Φ620 × 70 | 24.41″ |
| Φ620 × 90 | 24.41″ |
| Φ630 × 38 | 24.80″ |
| Φ630 × 40 | 24.80″ |
| Φ630 × 45 | 24.80″ |
| Φ630 × 50 | 24.80″ |
| Φ630 × 55 | 24.80″ |
| Φ630 × 58 | 24.80″ |
| Φ630 × 60 | 24.80″ |
| Φ630 × 65 | 24.80″ |
20# — common questions
- What is 20# equivalent to?
- 20# is closest to ASTM A106 Gr.B, AISI 1020, JIS S20C, DIN St 35. These are the standard comparisons used for sourcing; the mill certificate supplied with each shipment carries the actual chemistry and mechanical values for the heat.
- What sizes of 20# do you stock?
- We currently hold 465 size combinations of 20#, from Φ95mm to Φ630mm outside diameter with wall thickness from 15mm to 120mm.
- Can you supply 20# heat treated?
- Yes. We supply 20# in these delivery conditions: Hot rolled, Normalized, Stress relieved. Heat treatment is done in-house before shipment and process records with temperature curves ship with the goods.
- Can 20# be cut to length before shipment?
- Yes. We saw-cut to fixed lengths with a typical tolerance of ±1–2mm and end squareness of ≤1mm/100mm, so the material can go straight onto your machine without a facing operation.
Need 20# in a size that isn't listed?
Non-standard sizes are our specialty — and for repeat requirements we hold dedicated stock. Send your size list and we'll confirm within 24 hours.